EPUB is the distribution and interchange format standard for digital
publications and documents based on Web Standards. EPUB defines a moyen de
Representing, packaging and encoding structured and Semantically enhanced
Web content - Including XHTML, CSS, SVG, images, and other resources -
for distribution in a single-file format.
EPUB allows publishers to Produce and send a single digital publication
file through distribution and offers interoperability Between Consumers
software / hardware for unencrypted reflowable digital books and other
publications.